DW's employer has a 403(b) ALT plan (no SS). Her employer contributes 5.3XX% of her salary to TIAA's Guaranteed Fund on her behalf. This % is fixed and there is no choice where her employer's part goes while she is employed. So she is in the fund - like it or not. (TIAA "guarantees" principal is preserved plus a conservative rate of return - 3% for 2012 and historically more than that for the life of the fund.)
She is also required to contribute 3% minimum. Her part can be invested in the full range of TIAA-CREF funds - so a decent cross-section of investments. She contributes more - let's say it is 60% of the total invested monthly with TIAA-CREF with her employer's portion being 40% of the monthly total.
Retirement target is 9 years from now when DW turns 60. She will be eligible for a humble but decent pension then and let's say she has a paid-off home. She will be eligible for a small SS benefit due to previous employers - say, $500/month at 62.
This isn't the whole scenario, but you get the idea - how aggressive would you be with DW's portion?
(DW says: "Why don't we put it ALL in the Guaranteed Fund?" We never should've gone over those brokerage statements together back in "aught-two".